Tire-vulcanizing mold



June z5, 1929. 1w. BRUNDAG'E 1,713,631

TIRE VULCANIZING MOLD Filed Jan. 31, 1928 3 Sheets-Sheet l /Q ATTORNEY.June 25, 1929- J. w. BRUNDAGE TIRE VULCANIZING MOLD Filed Jan. 5l,`1928 3 Sheets-Sheet 2 NVENTOR Jfzzesfwage,

` ATTO R N EY U l Hw N21 June 25, 1929. J. w. BRUNDAGE TIRE VULCANIZINGMOLD 3 Sheets-Sheet Filed Jan. 3l, v1928 NN Q@ .@.WME

INVENTOR JEU/e6 Wf'wzclaga ATTORNEY raam@ June 25, i929.,

UNITED STATES JAMES W. BRUNDAGE, OF AKRON, OHIO, .ASSI(`1'JT013K;l TOLAMBERT TIRE & RUBBER CO., OF AKRON, OHIO, A. CORPORATION 0F ARIZONA.

Tinavuiioanizme Morin.

Application led January 31, 1928. Serial No. 250,870.

My invention relates to the art of manu` facturing tires and especiallyto that branch of the art dealing with .the manufactureot pneumatictires having unusually thick treads.

An object ot the present invention is to provide a mold composed of arelatively stationary part and a relatively movable p art, between whichparts t-he tire to be vulcanized is enclosed, one of the parts of themold carrying core pins Whichfafter the Dmold is closed, 'are arrangedto be forced into and transversely through the tread rubber stock toprovide holes therein; the pins being adand cylinder arrangementdirectly acting on the pin carr ing spider. I

Further o jects of the invention are'to render more practicalvulcanizing molds em-y bodying the pin features than those heretotoreproposed to provide a meaiisfor mounting the pins which will preventpin-warping and which will permit convenient and ready replacement ofparts when and if necessary; to provide for the reduction to the minimumoit friction between moving parts. y Again it is an object of theinvention to provide'a heater of the watch-case type having removablemold-walls proper, one half section of which is removably mounted in thestationary part of the heater and the other halt section is removablymounted in the movable wall or door of the heater, the outer wall of thedoor section and mold-wall half carried thereby being secured togetherby a set of pin guides as Well as by bolting the parts together, inwhich pin guides the tread hole producing pins have sliding ts, asuitable cylinder and piston arrangement with piston rod beingfmountedon the door section and connected with a belllike-'spider to whoseannulus the hole-forming pins are fastened, a suitable guide bracketwith a bearing for the piston rod being also secured to the door. l

Other objects will in part be obvious and in partbe referred tohereinafter. i 'llo the attainment of the aforesaid' object and ends, myinvention consists in the novel details ot construction and in thecombina tion, connection and arrangement oli parts, hereinafter morefully described and then pointed out in the claires.

,In the drawings:

Figure l is a side elevation and part section ofha watch-case typeheater with-my invention applied.

Figure 2 is an end elevation of the same and part central verticalAcross section on the line 2-2 oit Figure 1.

Figure 3 is an enlarged detail section of a portion of the apparatusshowing a pin sleeve in longitudinal section..

Figures 4, 5 and 6 are side elevations illustrat-ing one each of thepuncturing pins, the guide sleeves and the sleeve bushings respec- Atively. vanced and Withdrawn in unison by ax piston Figure 7 is a crosssection talren on the line 7-7 on Figure 3.

Figure 8 is an inside elevation of a portion of the clamp ringin thearea indicated b theline [lL- A on Figure l, the relative positions ofthe other Aclamp ring and the rack portion of the stationary section,and also the entering and the clamped positions oit the main wedge otthe door being shown in dotand dash lines.

Figure 9 is a detail perspective view oit a toolthat may be used toengage the rack portions.

Figure 10 is an edge view and part section of one mold door.

In the drawings, in which like numerals of reference indicate like partsin all the ligures, 1 represents the stationary section of the heater.ln watch-case heaters it is coinmon practice to provide a stationarysection oit dual construction with aldoor section on each side so thattwo tires may be cured at once. Sine/e the structures `at each side ofthe mid-plane ot the stationary section are alike, Vfor convenience otillustration only .one-halt of the stationary section is described indetail, it being understood that the structure on the side illustrated-in detail is duplicated on the other side.

The stationary frame section l includes a base 2 through the medium otwhich the heater is bolted down to the Hoor or other' suitablesupporting bed. "lhe stationary section 1 comprises an inner annularwall 3 and an outer annular wall t united by suitable connecting webs 5and provided between these Walls 3 and 4t is a steam chamber 6 intowhich steam is admitted through suitable openings to heat the mold`Walls to the desired temperature. The stamovable mold proper.

tionary :trame section is provided with hinged lugs 7 to which the doorsection is hinged in a manner presently to be explained.

A clamp ring track flange 8 is provided on the stationary section 1 ofthe heater on which the clamp ring 9 is fitted, the ring 9 havingrotational movement around the a-Xis` of the heater for a purposepresently understood. In order toapply the clamp ring to the flange 8the ring is made in a plurality oitv sections Which are bolted togetherby bolts 15 passing through abutting flanges 14.

The clamp rin 9 has a groove 10 to receive the track ange 8 and it alsohas an oil groove 11 for lubrication purposes. Projecting laterally thering 9 has a plurality of hooks 12 Whose operating faces are providedwith replaceable Wedges 13, the purpose'of which will presently be madeclear. rlhe ring 9 is also provided with an ear 16 to which power rodfrom a piston and cyl` inder (ses.y lFig. 1) may be applied for thepurpose of imparting rotational movement to the ring 9. As the means forimparting rotational movement to the ring 9 can be of any suitable kindillustration of specific means for that purpose is thought unnecessarysince such means are Well known.

The ring 9 is also provided with a rack portion 17 and the stationaryframe member 1 is provided with a similar rack portion 18 between whicha pinion may be placed with suitable provision for rotating thepinionto.

thereby impart rotation to the ring 9. This being another or auxiliarymethod of moving the ring. See Figures S and 9.

19 is the main Wedgeway of the ring 9 which cooperates with the mainwedge 25 on the door 20. The door 20 comprises an outer annular wall 21'and an inner annular wall 22 united on the outer side by a suitable webvof metal which is bored at intervals at 57 to receive the tread formingpin guide shanks hereinafter again referred to.

The door is provided with carrying lugs 23 carrying replaceable wedges24 which eooperat-ewith the wedges 13 of the hooks 12 of the clamp ringt-hereby to hold the door entirely closed When the clamp ring shall havebeen rotated to bring its Wedges into engagement with the wedges of thedoor.

The door is provided with arms 26 having hinge pin lugs 27 to cooperatewith the hinge lugs 7 of the stationary section. The stationary section1 of the heater is provided with an inner seat 28 for one-half of there- It is also provided with an outer seat 29 for the same purpose. Thedoor 20 is provided with an inner seat 30 and an outer seat 31 for theother halt-of the removable mold section proper.

The removable mold sections proper (numbered 33 and 43 respectively) aresecured to their respective sections of the heater by suitable screws32, the mold half 33 being secured to the stationary section 1 and themold half the seat 29. The stationary mold halt 33 has a plane face 36located in the central longitudinal plane ofthe heater unit, the tace 36having countersunk portions 37. The mold section 33 also has an overhungflange 38 and is' provided with a tread forming face 39 and a side wallforming face 4() as shown. At the inner portion of the side wall face 40the mold section 33 is provided with a seat 41 for the bull ring 88.

Adjacent to the tread forming face 39 the mold section 33 is providedWith pin end sockets 42 into which the correspondingly shaped points ofthe tread hole producing pins, hereinafter referred to, are adapted toseat at times. The other section of the mold proper 43 has inner andouter seats 44 and 45 respectively to match the seats 30 and 31 of thedoor. 1t is also provided with a central plane face 46 corresponding tothe tace 36 of the opposed section, the face 46 having a 'countersunkportion 47 opposing the portion 37 of the other section 33 of the moldand a seat 48 to receive the overhang flange 38.

49 is the tread forming surface ot the mold section 34, and 50 is theside wall forming face thereof and 51 is the bull ring seat whichcorresponds to the bull ring seat 41 of the opposite section.

.That section of the mold proper 43 which Yis mounted on the door hassuitably spaced pin bores 52, the ends of which, adjacent the lnoldingcavity, are counterbored at 53 and bushed with suitable bushings 54. Theopposite end of each bore 52 is counterhored at 55 and tapped as at 56.The outer vertical wall of the door is bored at 57, the number of borescorresponding to the number of bores 52 and aligning with the same. thebores 57 serve to receive the guide sleeves 58. The guide sleeves 58each consists of the portion which projects through the bore 57 and anenlarged spacer section 59 which braces and spaces the mold sectionproper 43 with relation to the door 20. The end of the guide sleeve 58which is adjacent the mold section 43 is threaded at 60 to enter thethreaded .portion 56 of the counterbore 55 and become lsecured to themold section 43. The other end of the sleeve 58 is threaded at 61 toreceive the 3am nut 62.

, A suitable bushing 63 is inserted into the outer end of each sleeve 58and bored to perniit passage with a neat sliding fit of the tread-holeproducing pins G4. Each pin 64 has one end pointed at 65 to lit therecess or socket 42 when brought into relation therewith and each pin 64has its other end threaded at 66` byv means of which it is secured tothe annulus 68 of the pin carrying spider 6T,

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.suitable jam nuts being employed tor the purpose. The pin carryingspider 67 .is provided with a piston rod receiving.; portion o9 andsuitable openings i through which arms ot the guide bracket may projectsil is a cylinder whose arms T2 are bolted at T3 to the danfre ring otthe door 20. 'llhe cylinder 71 is provided with taps 'l and 75 tor theadmission and exhaust of the necessary working' fluid that gives motionto the piston. (This may be either compressed air, water or steam.) rthecylinder is provided with a head 'i'Gand a gland 77 through which thepiston rod 79 Works, the piston 78 being secured to the rod and locatedWit-hin the cylinder in the usual manner.

lhe piston rod 79 is threaded at 80 to receive the piston and at 8l itis threaded to screw into the piston rod receiving portion 69 ot' thespider (Si so that the spider and piston rod will move in unison. rl`hepiston rod 'i9 also has a guide portion 82 that slidably passes througha guide;V bearing 86 in the n'uide bracket 85, the outer end oit theguide portieri 82 ot the piston rod 79 being threaded at 83 to receive astop tlange and nut 8d. rlhe guide bracket 85 has its arms bolted at 8i'to the door as will be clear trom the drawings.

The bull ring 88 has seats 89 to cooperate with the seats il and 5l andit is also prou vided with lugs 90 through which and through lugs 91 onthe stationary section l ot the heater, bolt-s 92 are passed to securethe bull ring to the stationarysection of the heater.

Siol tar as described the manner in which my invention operates is asfollows: litter the tire carcass has been built up and supplied with therequisites of tread rubber, an air bag is placed Within the carcass andthe carcass and air bag placed Within the heater, it being, of course,understood that the clamp ring is first rotated to unlock the door andthe door is swung open. fitter having placed the tire in the moldsection 33 the door is closed, it being understood that at this time thepins have been Withdrawn trom the moldingcavity.Suitableairpressureisintroduced into the air bag' and aiter the tire hasbeen in the mold a short time (sutticientto soften the rubber) thepiston in the cylinder is impelled in a direction to cause the pins topenetrate the tread portion ot" the tire.. 'lhe parts are then lett inthis position until a proper cure ot the tire has been etl'ected. Alterthe tire has been in the mold a suitlcient time to become cured properlythe motion oit the pins iis reversed and the pins Withdrawn, at'terwhiclnthe mold is unlocked and the door opened. 'lhe tire can then bereadily removed from the mold and the operations repeated on anothertire. i

lt should be understood that various changes and modications in thedetails ot construction, term and design ot parts, can.

be made Withoutdeparting trom the spiritot the invention or the scope otthe appended claims.

-`What ll claim is:

l. ln a tire mold having a molding' cavity, and apertures ttor thepassage ot core pins into and trom the molding cavity and core pinscooperating with said apertures; means for advancing and retracting' thecore pins into and from the molding cavity, said means comprising aspider to which said pins are attached, a cylinder with piston andpistonl rod mounted on the mold, said piston rod be-' ing connected tosaid spider whereby upon movement of the piston in one direction or theother the pins kwill be correspondingly moved.

2., lin tire molds ot the sectional type having moldinf@r cavities, oneoi the sections havingr apertures to permit passage ot core pins intothe mold cavities and a member to which said pins are secured; means tormoving said member to advance and retract the pins, said moving meanscomprising; a cylinder and piston with piston rod mounted on the moldwith the axis otf the piston rod paralleling the anis of the mold, saidpiston rod being); connected to said member which carries the pins andmeans for admittingr motive Fluid into the cylinder' to impart motiontothe piston.

ln tire molds oit the sectional type hav inprnoldingur cavities, one oitthe sections hav ingl apertures to permit passage of core pins intothe-molding cavities and a member .to which said pins are secured; meanstor moving said member to advance and retract the pins, said movingvmeans comprising a cylin der and piston with piston rod mounted on themold With the axis ot the piston rod paralleling the axis ot the mold,said. piston rod being connected to said member which carries the pinsand means tor admitting motive fluid into the cylinder to impart motionto the piston, a yoke carried by a mold section andhaving bearing forsaid piston rod.

el. ln heaters ot the watch-case type Wherein is provided a relativelystationary vnfiember and a door member hinged thereto; a mold propermounted within said members, said mold proper consistingr of arelatively stationary section and a relatively movable see- .tion, corepin guides associated with said relatively movable section ot the moldproper and with the door, core pins operable in said guides and adaptedto be projected through the mold chamber, a cylinder mounted on saiddoor, a piston and piston rod carried by the cylinder, a spider carriedby the piston rod and having an annulus to which said pins are securedand means tor admitting; motive tluid to and exhausting motive tluidtrom said cylinder to operate said piston and thereby move said pinsaccordingly.

5. ln heaters of the Watch-case type Wherein is provided a relativelystationary mem- Cil lil@

' stationary section and a relatively movable section, corev pin guidesassociated with said relatively movable section of the mold proper y andwith the door, core pins operable in said guides and adapted to beprojected through the mold chamber, a cylinder mounted onl l said door,a piston and piston rod carried by 'the cylinder, a spider carried bythe piston rod and having an annulus to which said pins are secured andmeans for admittlng motive riuid to and exhausting motive fluid fromsaid cylinder to operate said piston and thereby move said pinsaccordingly, and a yoke member secured to said door and having a bearingfor said piston rod.

6. In watch-case heaters, a relatively stationary section and a doorhinged thereto, a mold proper consisting of a relatively stationarysection secured to the relatively stat-ionary section of the heater anda relatively movable section secured to the door, said sections of themold proper enclosing, when brought together, the mold :chamber for thereception. of the tire, core pin guides mounted on the door and therelativelyv movable mold section, core pins operable in"'said guides andadapted to be projected into and through the mold chamber, a cylindersecured to the door with its axis paralleling they axis of the heater, apiston in said cylinder,

a piston rod carried by the piston, a spider having openings and securedto said piston v rod` said spider havingan annulus to which said pinsare secured, a yoke passing through theopenings of said spider andsecured to said door and having a bearing for said piston rod.

7. KIn combination with a tire mold having a molding cavity, of a pincarrying member,

core pins carried by said member, said mold having apertures for thepassage of said pins into and from the molding cavity, and cylinder andpiston mechanism including a piston rod directly connected to said pincarrying member, the axis of said piston rod aralleling the axis of themold, whereby w ien said piston is impelled 1n one direction the pinswill be advanced and when saidpiston is impelled in the oppositedirection said pins will be retracted, and means for admitting motiveHuid into and exhausting the same from said cylinder.

8. The combination of a tire mold having an annular molding cavity, of apin carrying member, core pins carried by said member, `said mold havingapertures for the passage of said pins into and from the mold cavity,mechanism mounted on said mold along the axial line thereof andconnected to said pin carrying member for moving Ithe same in thedirection of the axis of the mold to advance and c retract said pins,said moving means comprising a cylinder with piston and piston rodmounted on said mold with the piston rod lying parallel to the axis ofthe mold for the purposes specified.

9. In vulcanizing molds, a heater comprising a relatively stationarypart and a'relaltively movable part separable from the stationary part,means for locking said parts together, a mold 'proper consisting of tWosections, one mounted in the movable part and one in the stationarypartof the heater, said mold proper enclosingla molding chamber adapted toreceive the tire to be vulcanized, pins carried by said heater, saidmold proper having apertures to permit passage of said pins into themolding chamber, a cylinder and piston device carried by one of theparts of said heater, said piston and cylinder device including apistion rod, aA spider connected to said piston rod and havin a portionto which said pins are secured, W iereby upon movement of the piston rodthe pins will be advanced or withdrawn accordingly as the piston rodmoves in one direction or the other, and means for supplying motivefluid to said cylinder and piston device.

10. In vulcanizing molds of the watchcase heater type wherein isprovided a relatively stationary heater section and a door sectionhinged thereto and means for securing the door closed; a removablevulcanizing mold proper carried within the heater and comprising arelatively stationary half and a relatively movable half, the formerbeing secured to the stationary part of the heater and the latter beingsecured to the door, said mold proper having core pin apertures, corepin guides secured to the door and the corresponding half of the moldproper, each of 1 said guides including a tubular portion having abearing bushing for the core pins, a second bearing bushing for eachcore pin being Carried b v the haltl of the mold proper which isattached to the door, a spider havingan annulus to which said core pinsare secured, a piston and cylinder device including a piston rod,mounted on the door with the piston rod lying coincident with the axisof the heater, said piston rod being secured .to said spidersubstantially as shown and described.

l11. In vulcanizing molds of the watchcase heater type wherein isprovided a relatively stationary heater section and a door Which isattached to the door, a spider having an annulus to which said core pinsare secured, a piston and cylinder device including a piston rod,mounted on the door With the piston rod lying coincident with the axis1U of the heater, said piston rod being secured to said spider, saidspider having openings, a yoke having a bearing located outside of the`spider and having arms projecting through the spider openings andsecured t0 said door, said yoke bearing adapted to receive said pistonrod; Y

12. In' vulcanizing molds of the Watch-' case heater type wherein isprovided a relatively stationary heater section and a door sectionhinged thereto and means for, securing the door closed; a removablevulcanizing mold proper carried Within the heater and comprising arelatively stationary half and a relatively movable half, the formerbeing secured to the stationary part of the heater and the latter beingsecured to the door, said mold .proper having core Vpin apertures, corepin guides secured to thev door and the corresponding half of the moldproper, each of said guides including a. tubular portion having abearing bushing for the core pins, a second bearing bushing'for eachcore pin being carried by the haltl of the mold proper which is attachedto the door, a spider having an annulus to which said corepins aresecured, a piston and cylinder device ineluding a piston rod, mounted onthe door with the piston rod lying coincident With the axis of theheater, said piston rod being secured to said spidersaid spider havingopenings, a yoke having a bearing' located outside of the 4spider' and,having arms projecting througlrthe spider openings and secured to saiddoor` said yoke bearing adapted to receive said piston rod, and anadjusting device on said piston rod for limiting the stroke thereof. 4

' JAMES We BRUNDAGE.

